.form-inline {
  display: flex;
}

/* 通过级联这种方法控制bs的样式 */
.form-inline .btn,
.form-inline .form-control {
  margin: 1rem;
}

/* 弹出框定制 */
#div-alert {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  display: none;
}
